Is there an interface similar to Callable but with arguments?

Question

Is there an interface in Java similar to the Callable interface, that can accept an argument to its call method?

Like so:

public interface M         


        

Answer 1

I've had the same requirement recently. As others have explained many libs do provide 'functional' methods, but these do not throw exceptions.

An example of how some projects have provided a solution is the RxJava library where they use interfaces such as ActionX where 'X' is 0 ... N, the number of arguments to the call method. They even have a varargs interface, ActionN.

My current approach is to use a simple generic interface:

public interface Invoke  {     
    public T call(V data) throws Exception;     
//  public T call(V... data) throws Exception;    
}

The second method is preferable in my case but it exhibits that dreaded "Type safety: Potential heap pollution via varargs parameter data" in my IDE, and that is a whole other issue.

Another approach I am looking at is to use existing interfaces such as java.util.concurrent.Callable that do not throw Exception, and in my implementation wrap exceptions in unchecked exceptions.